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|  DSH 416& K9 C3 G( z0 Y2 x9 V5 I- c
, X* `3 k) B$ {, j# I
| Leakage current of floating circuits
) X1 ?4 `4 r7 p | 20, 20.2
+ u% J7 E0 S; J | 60601-1(ed.2);am1;am2
6 O. u1 g" X: }/ d$ Z4 C |
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Standard(s)- (year and edition):4 c# j$ @ p5 w: _# y
IEC 60601-1:1988 Ed.2 Am1+Am28 I1 C7 o4 s' {1 N
Sub clause(s): 20, 20.2. s6 W- d$ b9 `
Sheet n°: DSH-416
" U5 j! {5 D! n4 n0 USubject: Leakage current of floating circuits
7 Z7 B7 B6 z4 {Key words: Floating circuits, leakage current' e% n& e* ] N, b4 ^1 I
Confirmed by CTL at its 39th meeting, in Cologne9 ~/ b2 \' ^: ?2 H" K$ s
Question:
1 ]. k+ M2 @" S5 j9 S! z7 tEQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be
- _! }1 {- _7 X. K" Q- dconsidered as LIVE, since contact with these parts could not result in excessive leakage8 G; R& H" C3 p- C4 u8 s
currents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no" `- w$ `/ h$ r% l
requirements for safety separation between these circuits and ACCESSIBLE PARTS or
1 v6 g! d. c1 A% KAPPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
" r" }9 [' h$ q/ j, \; V& glead to currents exceeding the values given in Table IV.7 h4 i+ q- k. W7 h# P' b
Decision:
8 z# h8 U' d$ K% zIf the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such
. O# v E+ t0 K4 Sinsulation should be short-circuited before determining whether a part is LIVE. This shortcircuit
1 Y; f2 w% I$ ?should not be treated as a SINGLE FAULT CONDIT ION unless the insulation
) h% h7 o: @0 h# Xconcerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION4 `; e) a" L* S" O1 b( r0 C/ \: N
necessary for the voltages within the isolated part.( m% G8 r# w6 z7 a" j& j
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7 Q3 H! i& Q, u3 {
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发表于 2012-11-5 11:11
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